Hydraulic release system with manually operated hydraulic lock valve for spring-applied, hydraulically-released parking brake system

摘要

A hydraulic manifold assembly for use in a hydraulic release system operable to control a spring applied, hydraulically released parking brake assembly, includes a manifold block and a manually operated hydraulic lock valve assembled in the manifold block. The manifold block includes a high pressure inlet port, an actuator port for connection to a brake release actuator, an outlet port for connecting to a hydraulic fluid reservoir, and an internal passage connecting an actuator port to the outlet port. The manually operated lock valve is manually movable between an open position allowing flow of hydraulic fluid from the actuator port to outlet port and a closed position blocking flow of hydraulic fluid from the actuator port to the outlet port, the hydraulic lock valve in its closed position containing pressurized fluid in the actuator to keep the brake released.